/*
 * Copyright 2019 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 *
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.model;

import java.util.Collection;
import java.util.function.Function;

public interface Prototype extends NamedModelItem {

    Object UNDEFINED_VALUE = new Object();

    Collection<String> getFieldNames();

    Field getField(String name);

    int getFieldIndex(final String name);

    default Function<PrototypeFact, Object> getFieldValueExtractor(String name) {
        Field field = getField(name);
        return field != null ? field.getExtractor() : p -> p.has(name) ? p.get(name) : UNDEFINED_VALUE;
    }

    boolean isEvent();

    Prototype setAsEvent(boolean event);

    interface Field {
        String getName();

        Function<PrototypeFact, Object> getExtractor();

        boolean isTyped();

        Class<?> getType();
    }
}
